hello i just got me a go 21 5 port.(used).i have a 14t clutchbell.these are the two pipes i have. dynamite 007ht and a sts 0403. what pipe would be better on this engine.its going to be alteast a month before i could buy the right pipe. so i would like to khow of these two pipes which one would give me the better performance, i use it on small to medium tracks. thanks